Planer-knife.



PATENTED NOV. 28, 1905.

F. L. GONFORTH. PLANER KNIFE. APPLICATION FILED MAY 17, 1905.

WITNESSES.

PATENT OFFICE.

FRANK L. CONFORTH, OF BALLARD, WASHINGTON.

PLANER-KNIFE.

Specification of Letters Patent.

Patented Nov. 28, 1905.

Application filed May 17, 1905. Serial No. 260,745.

To all whom it may concern:

Be it known that I, FRANK L. CoNFoRTI-I, a citizen of the United States,residing at Ballard, in the county of King and State of Washington, haveinvented certain new and useful Improvements in Planer-Knives, of whichthe following is a specification, reference being had therein to theaccompanying drawings, in which Figure 1 is a perspective view of aplanerknife embodying my invention. Fig. 2 is an end viewofaplaner-head, showing such knives operatively secured thereto; andFig. 3 is a fragmentary cross-sectional View of a planerhead with othertypes of knives attached.

My improvements have reference to planerknives in which as hithertoordinarily constructed the meeting edges of the advance bevel-faces withthe inner faces form the cutting edge, tear or splinter the surface ofthe wood being dressed when revolving in a direction opposite to thegrain of the wood, and leave an uneven surface.

The object of the present invention is the provision of a planer-knifewhich is capable of overcoming the above-mentioned objectionsirrespective of the direction of the grain of the wood, the depth of thecut, or the velocity of the feed. I attain this and other ends by thenovel construction of a planer-knife which will be hereinafterdescribed, and particularly pointed out in the appended claims.

In the drawings the reference-letter A represents a planer-knife havinga rabbet B along its forward and inner edges, having its walls 6 and bin planes, respectively, parallel with and rectangular to the knife-facea, or approximately so. The angle C, which the wall 6 makes withtheEbevel-face a, is the cutting edge of the knife and the wall 5 thechipbreaker. These knives are secured to the head S in any suitablemanner, as by bolts D, having their heads d engaged in the head T-slots, as ordinary.

In operation the chips are impinged against the wall 6 and are therebybroken or crumbled, thus preventing the splintering or tearing of thewood fibers and insuring a smooth surface being made.

Referring now to Fig. 3, I show the ordinary planer-knife K, which isadapted only for cutting the forward ends of the chips and prying thesame from the wood, and which last operation is commonly aggravated bythe provision of the lips L on the head S. I am aware that heads havebeen utilized without such lips and cutting edges of the knivespositioned at a short distance in advance of the head-face, which isrectangular to the knife with the view of preventing the prying off andbreaking of the chips, as aforesaid; but such contrivances are soonabandoned from the fact that the chip-points are driven into the seambetween the knife and the head and shortly unfits the knives foraccomplishing any work. Plates, such as P, placed between the knives andthe head and having rectangular front faces p have also been tried; butare even less satisfactory than where the knives are secured directly tothe head, as the seams still remain and are even more readily openedthrough the multiplying of parts 19, causing increased vibrations of thepart when the machine is running. With my invention, however, there isno seam in the plane of the cutting edge of the knife, the breaking-wallreceiving the impact of the chips. The head may be made without the lipsabove alluded to and taking the wear from the head due to the abrasion0f the chips and extending its length of usefulness.

The thickness of the knives constructed according to my invention can bemade of less than half the thickness required in other types known to meand producing much better results.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. As a new article of manufacture, a onepart planer-knife provided witha recess extending its entire length and positioned at the inner side ofthe cutting edge said recess having one wall at right angles to theinner surface of the knife and the other wall in a plane parallel to thesaid inner surface of theknife.

2. A one-part planer-knife, provided with a rabbet B having a wall 5parallel with the knife-face a and awall b perpendicular thereto, saidfirst-named wall forming with a bevelface a of the knife the cuttingedge, substantially as described.

3. As a new article of manufacture a onepiece planer-knife provided witha beveled edge and a recess adjacent the beveled edge,

said recess having its walls at right angles one to the other, and saidrecess being of less depth than said beveled edge.

In testimony whereof I afliX my signature in presence of two witnesses.

FRANK L. CONFORTH.

WVitnesses:

PIERRE BARNES, E. VERNON.

